Judge Patrick Durcan, at Ennis District Court, said sentencing will take place on February 24.
Solicitor Bill O’Donnell said the planned date was suitable, having discussed the matter with Garda Inspector Tom Kennedy.
Ms O’Riordan with an address at Friarstown, Grange, Kilmallock had pleaded guilty to assaulting Garda Shane Dawson and two members of Airport Police at Shannon, Ronan O’Reilly and Eamon Power.
She also pleaded guilty to resisting/wilfully obstructing Garda Dawson in the execution of his duty contrary to Section 19 of the Criminal Justice (Public Order) Act 1994.
In evidence last month, the court heard an out-of-control Ms O’Riordan shouted: “I’m an icon, I’m the queen of Limerick” during an air rage incident at Shannon where she head-butted and spat in the face of one garda.
During the November 10 incident last year, the 44-year-old also spat in the face of, and kicked out at, an airport police officer, Insp Tom Kennedy had stated.
Ms O’Riordan had become unruly on a Shannon-bound Aer Lingus flight from New York during which she stood on the foot of a flight attendant, Carmel Coyne.
Insp Kennedy said: “Ms O’Riordan was quite irrational, quite aggressive and quite difficult.”
In a plea of mitigation, solicitor Mr O’Donnell said they “were the actions of a very, very ill person”.
He said: “Clearly from the evidence, she was somewhat out of control.
“Ms O’Riordan was going through a very, very difficult time.”
A medical report found Ms O’Riordan “looked exhausted, had poor insight into her altered mental state and the incident on the plane took place while she was quite unwell and this was caused by bi-polar disorder”.